Like? This isn't explained, I'm curious on why I would want to use it, but this is just an empty platitude, doesn't really give me a reason to try.
You can do all that in Git, but I sure as hell never did; and my co-workers really appreciate PRs that are broken into lots of little commits that can be easily looked over, one by one.
In a PR branch, my branches usually have a bunch of WIP commits, especially if I've worked on a PR across day boundaries. It's common for more complex PRs that I started down one path and then changed to another path, in which case a lot of work that went into earlier commits is no longer relevant to the picture as a whole.
Once a PR has been submitted for review, I NEVER want to change previous commits and force push, because that breaks common tooling that other team mates rely on to see what changes since their last review. When you do a force push, they now have to review the full PR because they can't be guaranteed exactly which lines changed, and your commit message for the old pr is now muddled.
Once the PR has been merged, I prefer it merged as a single squashed commit so it's reflective of the single atomic PR (because most of the intermediary commits have never actually mattered to debugging a bug caused by a PR).
And if I've already merged a commit to main, then I 100% don't want to rewrite the history of that other commit.
So personally I have never found the commit history of a PR branch useful enough that rewriting past commits was beneficial. The commit history of main is immensely useful, enough that you never want to rewrite that either.
While working on a maintenance team, most of the projects we handled were on svn where we couldn't squash commits and it as been a huge help enough times that I've turned against blind squashing in general. For example once a bug was introduced during the end-of-work linting cleanup, and a couple times after a code review suggestion. They were in rarely-triggered edge cases (like it came up several years after the code was changed, or were only revealed after a change somewhere else exposed them), but because there was no squash happening afterwards it was easy to look at what should have been happening and quickly fix.
By all means manually squash commits together to clean stuff up, but please keep the types of work separate. Especially once a merge request is opened, changes made from comments on it should not be squashed into the original work.
I try very hard to keep my PRs very focused on one complete unit of work at a time. So when the squash happens that single commit represents one type of change being made to the system.
So when going through history to pinpoint the cause of the big, I can still get what logical change and unit of work caused the change. I don't see the intermediary commits of that unit of work, but I have not personally gotten value out of that level of granularity (especially on team projects where each person's commit practices are different).
If I start working on one PR that starts to contain a refactor or change imthat makes sense to isolate, I'll make that it's own pr that will be squashed.